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Invasive pulmonary aspergillosis (IPA), most caused by Aspergillus fumigatus, is a serious life-threatening infection in immunocompromised patients. Voriconazole is used to prevent and treat IPA. However, little is known about the pharmacological characteristics of voriconazole in pulmonary epithelial cells, which are the target site for the prophylaxis and early treatment of IPA. The aim of the study was to evaluate the kinetics and activity of voriconazole against A. fumigatus in A549 cells. High-performance liquid chromatography/tandem mass spectrometry and time-kill method were used to study the cellular pharmacokinetic and pharmacodynamics of voriconazole. Voriconazole exerted a concentration-dependent toxic effect on A549 cells and could penetrate into cells, reaching plateau concentrations of 1.14 ± 0.64, 3.72 ± 1.38 and 6.36 ± 0.95 ng/mg protein after A549 cells were exposed to voriconazole at extracellular concentrations of 2, 8 and 16 mg/L for 2 h, respectively. The efflux of voriconazole was rapid, with a half-life of 10.2 min. Voriconazole can decrease the A. fumigatus conidia invade cells, and the number of viable A. fumigatus conidia in cells can be decreased 2.1- to 20.6-fold when A549 cells were cultured in medium containing voriconazole. After 24-h incubation, 75.6% and 80.5% of intracellular A. fumigatus were killed when extracellular voriconazole concentration was 8 and 16 mg/L, respectively. This study illustrated a new application for the prophylaxis and early treatment of IPA from the cellular pharmacokinetics and pharmacodynamics and emphasized the importance of monitoring concentrations of voriconazole in epithelial lining fluid in immunocompromised patients receiving voriconazole therapy. [ABSTRACT FROM AUTHOR]

This study evaluated whether contemporary echinocandin regimens achieved pharmacokinetic/pharmacodynamic targets in ICU patients and general patient populations (GPPs) and assessed caspofungin (CAS) regimens in hepatic impairment (HI) patients. A Monte Carlo simulation was performed using previously published data. Recommended dosing regimens of echinocandins in ICU patients, GPPs and healthy volunteers were evaluated: 70 mg loading dose then 50 mg maintenance dose (70/50 mg) for CAS; 100 mg q24h for micafungin (MCF); and 200/100 mg for anidulafungin (ANF). Moreover, CAS 70 mg and 100 mg q24h in GPPs, and CAS 70/50 mg and 70/35 mg in mild and moderate HI patients, respectively, were evaluated. Cumulative fraction of response (CFR) was calculated for each dosing regimen. For Candida albicans , CFRs for the recommended doses of CAS, MCF and ANF were 95.8%, 13.5% and 50.5% in ICU patients and 96.3%, 42.4% and 61.6% in GPPs, respectively; for Candida glabrata , CFRs were 99.4%, 90.6% and 44.6% in ICU patients and 99.5%, 97.1% and 59.8% in GPPs. For Candida parapsilosis , CFRs of echinocandins for standard regimens were <70%; only CAS 100 mg q24h achieved the target CFR. CAS 70/50 mg and 70/35 mg in mild and moderate HI patients were appropriate. Considerable interindividual variability was observed. For C. albicans and C. glabrata , CAS is good choice both for ICU and other patient populations, but for C. parapsilosis an increased dose should be considered. For MCF and ANF, administering higher doses with longer dosing intervals achieves better target attainment and should be investigated in clinical trials. [ABSTRACT FROM AUTHOR]

Study Objectives To assess the pharmacokinetic and pharmacodynamic ( PK/ PD) properties of voriconazole and to investigate the relationship between PK/ PD parameters and the efficacy of a fixed-dose oral regimen in the treatment of invasive fungal infections ( IFIs). Design Prospective and observational PK/ PD study. Setting A university-affiliated medical center. Patients Fifteen hospitalized patients with proven IFIs who were treated with oral voriconazole for at least 2 weeks. Methods We investigated the PK/ PD properties of voriconazole using a noncompartmental analysis in 15 patients. Results Marked interpatient variation in voriconazole pharmacokinetic properties was noted including peak plasma concentrations (median 2.31 mg/L, range 1.06-4.01 mg/L), 12-hour area under the plasma concentration-time curve ( AUCτ) (median 21.18 hr mg/L, range 7.71-42.07 hr mg/L), ratio of the unbound drug AUC over 24 hours ( fAUC24) divided by the minimum inhibitory concentration ( fAUC24: MIC; median 62.61, range 6.48-415.30), and the free trough plasma concentration (Cmin) divided by the MIC ( fCmin: MIC; median 1.81, range 0.46-15.52). There was a good correlation between voriconazole Cmin and AUCτ ( R2 = 0.805). Voriconazole therapy was effective in 66.7% of patients (10/15). No significant difference was observed with regard to successful clinical response between the patients with a fAUC24: MIC and fCmin: MIC values higher than 25 and higher than 1 (10/12 vs 10/13, respectively; χ2 = 1.61, p=0.688). Conclusion There is substantial interpatient variability in the PK/ PD properties of voriconazole. fAUC24: MIC values higher than 25 and fCmin: MIC values higher than 1 may predict clinical response in patients with IFIs. Designing an optimal dosage regimen based on individual PK/ PD properties will improve the efficacy in patients with IFIs. [ABSTRACT FROM AUTHOR]

Background: Invasive pulmonary aspergillosis (IPA) is a life-threatening disease in immunosuppressed patients. Voriconazole is commonly used to prevent and treat IPA in the clinic, but the optimal prophylactic antifungal regimen is unknown. The objective of this study was to clarify the mechanism underlying how voriconazole prevents IPA based on a target cellular pharmacokinetics/pharmacodynamics model, with the aim of identifying a way to design an optimal prophylactic antifungal regimen.Methods: A nystatin assay was used to establish a target-cells model for A. fumigatus infection. An inhibitory effect sigmoid Emax model was developed to explore the cellular PK/PD breakpoint, and Monte Carlo simulation was used to design the prophylactic antifungal regimen.Results: The intracellular activity of voriconazole in the target cells varied with its concentration, with the minimum inhibitory concentration (MIC) being an important determinant. For A. fumigatus strains AF293 and AF26, voriconazole decreased the intracellular inoculum by 0.79 and 0.84 lg cfu, respectively. The inhibitory effect sigmoid Emax model showed that 84.01% of the intracellular inoculum was suppressed by voriconazole within 24 h, and that a PK/PD value of 35.53 for the extracellular voriconazole concentration divided by MIC was associated with a 50% suppression of intracellular A. fumigatus. The Monte Carlo simulation results showed that the oral administration of at least 200 mg of voriconazole twice daily was yielded estimated the cumulative fraction of response value of 91.48%. Concentration of voriconazole in the pulmonary epithelial lining fluid and the plasma of > 17.77 and > 1.55 mg/L, respectively, would ensure the PK/PD > 35.53 for voriconazole against most isolates of A. fumigatus and may will be benefit to prevent IPA in clinical applications.Conclusions: This study used a target cellular pharmacokinetics/pharmacodynamics model to reveal a potential mechanism underlying how voriconazole prevents IPA and has provided a method for designing voriconazole prophylactic antifungal regimen in immunosuppressed patients. [ABSTRACT FROM AUTHOR]

Abstract Diagnosis of cervical tuberculous lymphadenitis (CTL), the most commonly occurring form of extrapulmonary tuberculosis, remains as a challenge in clinic. Detection of the presence of Mycobacterium tuberculosis (Mtb) in fine needle aspiration cytology (FNAC) samples is one golden criterion to confirm the CTL diagnosis. Due to the non-specific clinical presentation, CTL might be confused with other lymph node enlargement diseases; therefore empirical treatment with non-anti-TB antibiotics is often initially administered. However, it is still unclear whether this diagnostic antibiotic treatment affects the positivity of Mtb detection in FNAC. The demographics and clinical characteristics of 732 lymph node enlargement patients who had underwent FNAC were retrospectively analyzed and 605 (82.65%) of them were diagnosed as CTL. A total of 279 CTL cases (279/605, 46.11%) with completion of three Mtb tests (AFB, NAAT, and Mtb culture) in FNAC samples were selected for analyzing the effect of empirical antibiotic treatment on the positivity of Mtb tests. Compared to CTL patients without antibiotic treatment prior to FNAC, patients received empirical non anti-TB treatment had significantly lower positivity for acid fast bacilli staining (adjusted OR 0.11, 95% CI 0.06–0.21), nucleic acid amplification test (NAAT) (adjusted OR 0.38, 95% CI 0.21–0.71), and Mtb culture (adjusted OR 0.11, 95% CI 0.06–0.19). In conclusion, this study demonstrated that empirical non anti-TB antibiotic treatment reduced the opportunity to confirm CTL by microbiological analysis. Patients with cervical lymph node enlargement should undergo FNAC for Mtb tests prior to initiation of empirical non anti-TB treatment. Highlights • CTL accounted for the most cases of cervical lymph node enlargement. • CTL patients with typical tuberculous cytopathology tended to be found with higher positivity of Mtb in molecular and culture methods. • Empirical non-anti-TB antibiotic treatment reduced the opportunity to confirm CTL by microbiological analysis. [ABSTRACT FROM AUTHOR]